The Atal Tunnel has reduced the distance between Manali and Leh. Option 3 is the correct answer. The Atal Tunnel, also known as the Rohtang Tunnel, is a tunnel that connects Manali in Himachal Pradesh to Leh in Ladakh. It is the world`s longest tunnel at an altitude of about 3,000 meters above sea level. Before the construction of the tunnel, the only road between Manali and Leh passed through the Rohtang Pass, which was closed for a significant part of the year due to heavy snowfall. This resulted in a long and arduous journey for travelers. However, with the opening of the Atal Tunnel, the distance between Manali and Leh has been shortened, making it more accessible and convenient for people to travel between these two cities.